Hamid-Trick

To add Related posts/Similar posts widget below every post on your blog, follow these simple steps:
First of all download this file:
Zipped File
And upload the file (relatedPosts_ForBlogger2.js) to SigMirror.com or HotLinkFiles.com to get a DIRECT LINK to that file.

1. Go to Blogger.com
2. Now go to "Layout", then to "Edit HTML" section
3. Back up your present template, by "Downloading it"
4. Now click on "Expand widget templates"
5. Find this code: </head>
   Now, just before this code paste this

<!--RelatedPostsStarts-->
<style>
#related-posts {
float : left;
width : 540px;
margin-top:20px;
margin-left : 5px;
margin-bottom:20px;
font : 11px Verdana;
margin-bottom:10px;
}
#related-posts .widget {
list-style-type : none;
margin : 5px 0 5px 0;
padding : 0;
}
#related-posts .widget h2, #related-posts h2 {
color : #940f04;
font-size : 20px;
font-weight : normal;
margin : 5px 7px 0;
padding : 0 0 5px;
}
#related-posts a {
color : #054474;
font-size : 11px;
text-decoration : none;
}
#related-posts a:hover {
color : #054474;
text-decoration : none;
}
#related-posts ul {
border : medium none;
margin : 10px;
padding : 0;
}
#related-posts ul li {
display : block;
background : url(&quot;http://www.gigaimage.com/images/brrl1rtaziisu0yj6kj6.gif&quot;) no-repeat 0 0;
margin : 0;
padding-top : 0;
padding-right : 0;
padding-bottom : 1px;
padding-left : 16px;
margin-bottom : 5px;
line-height : 2em;
border-bottom:1px dotted #cccccc;
}
</style>
<script src='http://sigmirror.com/............/relatedPosts_ForBlogger2.js' type='text/javascript'/><!--RelatedPostsStops-->

Replace the link in RED with the DIRECT LINK, you got in the previous step.
6. Now search for this code line:

<data:post.body/>

And after this, paste these code lines

<!--RELATED-POSTS-STARTS--><b:if cond='data:blog.pageType == &quot;item&quot;'>
<div id='related-posts'>
<font face='Arial' size='3'><b>Related Posts: </b></font><font color='#FFFFFF'><b:loop values='data:post.labels' var='label'><data:label.name/><b:if cond='data:label.isLast != &quot;true&quot;'>,</b:if><b:if cond='data:blog.pageType == &quot;item&quot;'>
<script expr:src='&quot;/feeds/posts/default/-/&quot; + data:label.name + &quot;?alt=json-in-script&amp;callback=related_results_labels&amp;max-results=5&quot;' type='text/javascript'/></b:if></b:loop> </font>
<script type='text/javascript'> removeRelatedDuplicates(); printRelatedLabels();
</script></div></b:if><!--RELATED-POSTS-STOPS-->

To change the number of similar/related posts to be displayed, change the code max-results=xx
Finally save your template, and you will see related posts after all your posts(Remember to add labels after your posts, during publishing them)